CN110985659B - Control method for low-temperature cold start of automatic hydraulic transmission - Google Patents
Control method for low-temperature cold start of automatic hydraulic transmission Download PDFInfo
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- CN110985659B CN110985659B CN202010126237.XA CN202010126237A CN110985659B CN 110985659 B CN110985659 B CN 110985659B CN 202010126237 A CN202010126237 A CN 202010126237A CN 110985659 B CN110985659 B CN 110985659B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
- F16H61/0202—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric
- F16H61/0204—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal
- F16H61/0213—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal characterised by the method for generating shift signals
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/16—Inhibiting or initiating shift during unfavourable conditions, e.g. preventing forward reverse shift at high vehicle speed, preventing engine over speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
- F16H61/0202—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric
- F16H61/0204—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal
- F16H61/0213—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal characterised by the method for generating shift signals
- F16H2061/0232—Selecting ratios for bringing engine into a particular state, e.g. for fast warming up or for reducing exhaust emissions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H2200/00—Transmissions for multiple ratios
- F16H2200/20—Transmissions using gears with orbital motion
- F16H2200/203—Transmissions using gears with orbital motion characterised by the engaging friction means not of the freewheel type, e.g. friction clutches or brakes
- F16H2200/2043—Transmissions using gears with orbital motion characterised by the engaging friction means not of the freewheel type, e.g. friction clutches or brakes with five engaging means
Abstract
The invention discloses a control method for low-temperature cold start of an automatic hydraulic transmission, which comprises a start stage control step and a delay stage control step; after the engine is started at a low temperature, two clutches (B1 and C4) for controlling the neutral gear are in a disengaged state; when the engine reaches the maximum rotating speed and enters the operation stage, the engine continues to operate for a delay time t; and then two clutches (B1 and C4) for controlling neutral gear are locked, and the mode of combination after the engine finishes starting is waited, so that the strategy is favorable for reducing the load brought by the transmission in the process of starting the engine, thereby greatly improving the success rate of cold starting.
Description
Technical Field
The invention belongs to the technical field of automatic transmission control, and particularly relates to a control method for low-temperature cold start of an automatic hydraulic transmission.
Background
During the use of the automobile, ignition starting is the most common operation, and whether starting is successful depends on the starting capability of the engine and the magnitude of the load of the whole automobile. The engine has strong starting capability, the load of the whole automobile is small, the automobile is easier to start, and the time is shorter. The load of the transmission is an important influence factor of the load of the whole vehicle, so how to reduce the load of the transmission is related to the difficulty of starting.
In the whole vehicle development test process, normal-temperature starting mainly refers to starting at a temperature of above-10 ℃, is relatively easy, and cannot cause the problem of unsuccessful starting, but cold starting mainly refers to starting at a temperature of-30 ℃ to-10 ℃, can cause the situation of unsuccessful starting, particularly extremely low-temperature starting at-30 ℃, so that cold starting is one of the most important test contents in winter tests, and how to ensure the success of vehicle cold starting is a key index.
The current transmission is mainly from the hardware aspect: the load of the clutch is reduced by means of replacing the type of the oil pump, reducing the oil consumption and the displacement, reducing the belt displacement loss of the clutch and the like.
Current 6-to 8-speed Automatic Transmissions (AT) with a hydrodynamic torque converter usually consist of five shift elements, 1 brake B1, 4 clutches C1, C2, C3, C4, the brake being a special clutch and therefore hereinafter referred to collectively as a clutch, i.e. 5 clutches in total, and 5 solenoid-controlled clutches in total.
FIG. 1 is a logic diagram of the gears of a current automatic transmission, wherein 3 clutches corresponding to each gear are labeled, for example, gear 1 requires B1, C1 and C4 to be closed, and gear 5 requires C1, C2 and C4 to be closed; to quickly enter forward or reverse gear when in neutral, both clutches (B1, C4) are normally held engaged when in neutral.
The normal temperature starting and the low temperature starting adopt the same strategy, and the control process of the strategy is as follows: in the starting process of the engine, the transmission in a neutral gear state is combined with two clutches simultaneously, the belt row loss of the transmission can be increased, the load is increased, and the starting failure condition can be caused under the working condition that the starting capacity of the engine is insufficient under the condition of a low temperature limit.
As shown in fig. 2, for the currently generally adopted starting method, when the engine speed just rises and reaches about 500 revolutions, and at this time, the engine has not been completely started, the two clutches B1 and C4 for controlling the neutral gear of the transmission start to operate, the oil pressure reaches 20bar from 0bar, and this time inevitably brings load to the engine, and affects the engine starting.
As shown in fig. 3, at very low temperature, such as-30 ℃, the engine has weaker starting performance than normal temperature under the condition, if the two clutches B1 and C4 of the transmission controlling the neutral gear are actuated during the engine starting process, the condition that the starting capability of the engine is insufficient to overcome the load of the transmission occurs, the rotating speed is reduced, and finally the rotating speed becomes 0, and the starting fails.
At present, no technical measure for reducing the load of the transmission from control software exists at home and abroad.
Disclosure of Invention
The invention aims to solve the technical problem of providing a control method for low-temperature cold start of an automatic hydraulic transmission, overcoming the defects in the prior art, and realizing reduction of load brought by the transmission side in the process of starting an engine by adopting the control method, thereby improving the success rate of cold start.
In order to solve the technical problems, the technical scheme of the invention is as follows: a control method for low-temperature cold start of an automatic hydraulic transmission is characterized by comprising a start stage control step and a delay stage control step;
after the engine is started at a low temperature, two clutches (B1 and C4) for controlling the neutral gear are in a disengaged state; when the engine reaches the maximum rotating speed and enters the operation stage, the engine continues to operate for a delay time t; the two clutches (B1, C4) controlling neutral are then locked.
In an optimization scheme, the starting phase control step comprises the following steps:
after the engine is started at low temperature, the engine speed begins to rise, the control current and the applied oil pressure of two clutches (B1 and C4) needing to be locked in the neutral gear of the transmission are 0 and 0bar, and the two clutches (B1 and C4) are in a disengaged state.
An optimization scheme, the delay phase control step comprises:
when the engine reaches the maximum speed and the engine state is converted from the starting stage to the running stage, the engine is controlled to continue running for a delay time t, then a Transmission Control Module (TCM) controls two clutches (B1 and C4) required by neutral gear to be locked, and the engine enters a complete starting success state.
According to the optimization scheme, the transmission control module detects the water temperature T of the engine and detects the delay time T, and when the delay time T corresponding to the water temperature T of the engine is detected to be reached, locking control of two clutches (B1 and C4) required by neutral is carried out to prepare for subsequent gear shifting and action.
In an optimized scheme, the oil pressure for controlling the locking of the two clutches (B1, C4) is 20 bar.
In an optimization scheme, the relation between the delay time T and the water temperature T of the engine is as follows:
t =100ms when T is lower than-10 degrees and higher than-15 degrees;
t =200ms when T is lower than-15 degrees and higher than-20 degrees;
t =300ms when T is lower than-20 degrees and higher than-25 degrees;
t =400ms when T is lower than-25 degrees and higher than-30 degrees;
t =500ms when T is lower than-30 degrees.
By adopting the technical scheme, compared with the prior art, the invention has the following advantages: the strategy is beneficial to reducing the load brought by the transmission in the process of starting the engine by the mode of combination after the engine finishes starting, so that the success rate of cold starting is greatly improved.
Drawings
FIG. 1 is a logic diagram of a current automatic transmission gear;
FIG. 2 is a logic diagram of a present conventional startup approach;
FIG. 3 is a logic diagram of the present start-up at very low temperatures;
FIG. 4 is a logic diagram of a low temperature cold start control method for an automatic hydraulic transmission in accordance with an embodiment of the present invention.
Detailed Description
In order to more clearly understand the technical features, objects and effects of the present invention, the embodiments of the present invention will be described with reference to the accompanying drawings, and it will be understood by those skilled in the art that the following should not be construed as limiting the scope of the present invention.
The embodiment is characterized in that as shown in FIG. 4, the control method for the low-temperature cold start of the automatic hydraulic transmission comprises a starting stage control step and a delay stage control step;
after the engine is started at a low temperature, two clutches (B1 and C4) for controlling the neutral gear are in a disengaged state; when the engine reaches the maximum rotating speed and enters the operation stage, the engine continues to operate for a delay time t; the two clutches (B1, C4) controlling neutral are then locked.
Specifically, the start-up phase control step includes: after the engine is started at low temperature, the rotating speed of the engine is increased, two clutches (B1 and C4) needing to be locked in the neutral gear of the transmission are not controlled, the control current is 0, the actual oil pressure applied by the clutches is 0bar, and the two clutches (B1 and C4) are in a disengaged state; this minimizes the load due to transmission clutch engagement.
The delay stage control step includes:
when the engine reaches the maximum rotating speed and the engine state is converted from a starting stage to a running stage, a state signal is obtained by a Transmission Control Module (TCM) from an Engine Control Module (ECM); the engine continues to run for a delay time t, then the Transmission Control Module (TCM) controls the two clutches (B1, C4) required for neutral to lock, and the engine enters a full start success state.
The transmission control module detects the engine water temperature T and detects the delay time T, and when the delay time T corresponding to the engine water temperature T is detected to be reached, the two clutches (B1 and C4) required by the neutral gear are locked and controlled, the oil pressure is commanded to be 20bar, and preparation is made for subsequent gear shifting and actions.
The magnitude of the delay time T is subjected to calibration control based on the engine water temperature T, and the method specifically comprises the following steps: t =100ms when T is lower than-10 degrees and higher than-15 degrees;
t =200ms when T is lower than-15 degrees and higher than-20 degrees;
t =300ms when T is lower than-20 degrees and higher than-25 degrees;
t =400ms when T is lower than-25 degrees and higher than-30 degrees;
t =500ms when T is lower than-30 degrees.
Under extremely low temperature (below-10 ℃), the transmission clutch control adopts the above strategy, namely a mode of combining after the engine finishes starting, and the method is beneficial to reducing the load brought by the transmission in the process of starting the engine, thereby greatly improving the success rate of cold starting.
The above engine speed, delay time T, and engine water temperature T may also be adjusted according to actual conditions.
The foregoing is illustrative of the best mode of the invention and details not described herein are within the common general knowledge of a person of ordinary skill in the art. The scope of the present invention is defined by the appended claims, and any equivalent modifications based on the technical teaching of the present invention are also within the scope of the present invention.
Claims (3)
1. A control method for low-temperature cold start of an automatic hydraulic transmission is characterized by comprising a start stage control step and a delay stage control step;
after the engine is started at a low temperature, two clutches (B1 and C4) for controlling the neutral gear are in a disengaged state; when the engine reaches the maximum rotating speed and enters the operation stage, the engine continues to operate for a delay time t; then controlling the locking of two clutches (B1, C4) of the neutral gear;
the control step of the starting stage comprises the following steps:
after the engine is started at low temperature, the engine speed begins to rise, the current of two clutches (B1 and C4) which need to be locked and control the transmission neutral gear is 0, the applied oil pressure is 0bar, and the two clutches (B1 and C4) are in a disengaged state;
the delay stage control step includes:
when the engine reaches the maximum speed and the engine state is converted from the starting stage to the running stage, the engine is controlled to continue running for a delay time t, then a Transmission Control Module (TCM) controls two clutches (B1 and C4) required by neutral gear to be locked, and the engine enters a complete starting success state.
2. The method of controlling a cold start of an automatic hydraulic transmission as recited in claim 1, wherein: detecting an engine water temperature T and a delay time T, and performing locking control on two clutches (B1 and C4) required by neutral gear after detecting that the delay time T corresponding to the engine water temperature T is reached;
the relationship between the delay time T and the engine water temperature T is as follows:
t =100ms when T is lower than-10 degrees and higher than-15 degrees;
t =200ms when T is lower than-15 degrees and higher than-20 degrees;
t =300ms when T is lower than-20 degrees and higher than-25 degrees;
t =400ms when T is lower than-25 degrees and higher than-30 degrees;
t =500ms when T is lower than-30 degrees.
3. The control method for low-temperature cold start of an automatic hydraulic transmission according to claim 1, characterized in that the oil pressure for controlling the lockup of the two clutches (B1, C4) is 20 bar.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010126237.XA CN110985659B (en) | 2020-02-28 | 2020-02-28 | Control method for low-temperature cold start of automatic hydraulic transmission |
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| CN202010126237.XA CN110985659B (en) | 2020-02-28 | 2020-02-28 | Control method for low-temperature cold start of automatic hydraulic transmission |
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| CN110985659B true CN110985659B (en) | 2020-07-14 |
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| CN114893312A (en) * | 2022-06-08 | 2022-08-12 | 一汽解放青岛汽车有限公司 | Engine low-temperature starting control system, control method and automobile |
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| US6556910B2 (en) * | 2001-08-31 | 2003-04-29 | Aisin Aw Co., Ltd. | Control apparatus and method for vehicle having an idle stop function |
| US9765880B2 (en) * | 2013-12-26 | 2017-09-19 | Aisin Aw Co., Ltd. | Hydraulic control device of automatic transmission |
| US9732719B2 (en) * | 2014-10-31 | 2017-08-15 | Ford Global Technologies, Llc | Cold temperature engine start strategies |
| US10053099B2 (en) * | 2016-05-31 | 2018-08-21 | GM Global Technology Operations LLC | Multi-speed transmission and method of control |
| JP6547176B2 (en) * | 2016-09-27 | 2019-07-24 | 日立建機株式会社 | Work vehicle |
| CN108501681B (en) * | 2018-03-27 | 2019-12-17 | 吉利汽车研究院（宁波）有限公司 | low-temperature cold start device, low-temperature cold start method and automobile |
| CN108869720A (en) * | 2018-07-02 | 2018-11-23 | 盛瑞传动股份有限公司 | The method and automatic gear-box of automatic gear-box low temperature self study |
| CN110126811A (en) * | 2019-05-24 | 2019-08-16 | 浙江吉利控股集团有限公司 | A kind of engine start control system of hybrid vehicle, method and vehicle |
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